TheYellowCellPhone said:
I'd just text or call them.
Because really, who doesn't have a phone on them these days?
For various reasons, a number of people don't have phones (i lost mine, and we can no longer afford the rest of the family's for example). however, many people do have access to a boombox, and so it would only be appropriate to blast either a funny ringtone you found on the net, or boombox.
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The added bonus would be a spontaneous rainbow coalition of dancing. you just need to make sure to bring some extra pairs of fingerless gloves.